Water-cooled engine suitable for motorcycle and motorcycle

Abstract

The water-cooled engine comprises an air cylinder body, a crankcase cover and a water pump, the water pump comprises a water pump seat body integrated on the crankcase cover and a water pump cover installed on the water pump seat body, and the water pump cover and the water pump seat body form a water pump water cavity. The water pump water cavity extends towards the air cylinder body water inlet to form a water pump water outlet which is directly in butt joint with the air cylinder body water inlet. According to the water-cooled engine suitable for the motorcycle, the water pump seat body and the crankcase cover are integrated, and the water outlet of the water pump is directly butted with the water inlet of the cylinder body, so that a cooling water path is positioned in the engine, the structural design of a cooling system is optimized, and an external hose or a steel pipe is not needed; the occupied space of the cooling system is reduced, and the overall structure is compact.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycles, in particular to a water-cooled engine suitable for motorcycles and a motorcycle. Background Art

[0002] During engine operation, as the temperature continues to rise, the engine needs to be cooled in a timely manner to ensure engine performance and component reliability. In water-cooled engines, the following methods are commonly used: Method 1: coolant enters from the water pump inlet, and an external water pipe connects the water pump outlet to the cylinder block inlet; Method 2: the cooling water pump cover is directly assembled on the cylinder block and the water pump. The water pump cover and the cylinder block are sealed by an axially compressed sealing ring, and bolts are used to fasten the cylinder block; Method 3: a water channel is designed on the crankcase to connect to the water pump, and a transition water channel is designed between the cylinder block water channel and the case water channel.

[0003] For compact twin-cylinder motorcycles, the engine installation space is relatively small. If method one is used, the space required for the entire vehicle to be accommodated is relatively large, which increases the width of the entire vehicle and affects the comfort of the entire vehicle. If method two is used, the water inlet of the cylinder block extends too long from the outer edge of the joint surface, and the gap between the extended section and the right cover is too small, making the right cover difficult to disassemble and assemble. The water pump cover and the cylinder block fastening bolts are too close to the frame, making disassembly and assembly difficult, and it is difficult to ensure the compression of the sealing ring, posing a risk of water leakage. Method three transfers the water from the box body to the cylinder block cooling water channel, with water inlet from a single point, a long water channel, large water resistance, and poor engine cooling effect.

[0004] Therefore, there is an urgent need to develop a water-cooled engine and motorcycle suitable for motorcycles, which can effectively shorten the length of the water inlet passage and reduce the circulation resistance of the coolant. At the same time, the water inlet passage is a built-in structure and is arranged in the crankcase. There is no need for external pipes, which can optimize the structural design of the cooling system and reduce the space occupied by the cooling system. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a water-cooled engine suitable for motorcycles, which can effectively shorten the length of the water inlet passage and reduce the circulation resistance of the coolant. At the same time, the water inlet passage is a built-in structure and is arranged in the crankcase. There is no need for external pipes, which can optimize the structural design of the cooling system and reduce the space occupied by the cooling system.

[0006] The utility model is suitable for a water-cooled engine of a motorcycle, comprising a cylinder block, a crankcase cover and a water pump, wherein the water pump comprises a water pump seat body integrated on the crankcase cover and a water pump cover mounted on the water pump seat body and forming a water pump water cavity with the water pump seat body, the water pump water cavity extends toward the water inlet of the cylinder block to form a water pump outlet, and the water pump outlet is directly connected to the water inlet of the cylinder block; by directly connecting the water pump outlet to the water inlet of the cylinder block, the use of external hoses or steel pipes can be reduced, and at the same time, the engine is cooled by means of a built-in water channel, the water channel is short, and the flow resistance of the coolant is small.

[0007] Furthermore, the water pump outlet forms an outlet portion, the cylinder body water inlet forms an inlet portion, and the outlet portion and the inlet portion are interlocked with each other; the outlet portion and the water inlet are interlocked and installed with each other, which is beneficial to positioning, assembly and sealing.

[0008] Furthermore, the diameter of the inlet portion is smaller than that of the outlet portion, the outer circumference of the inlet portion forms a stepped shaft, the inner circumference of the outlet portion forms an annular groove, and the annular groove is provided with a step that cooperates with the stepped shaft;

[0009] A sealing ring I is provided on the outer circumference of the inlet portion; by forming a stepped structure and providing the sealing ring I, the sealing effect can be improved.

[0010] Furthermore, the relationship between the distance L1 from the bottom of the annular groove to the end of the step shaft and the distance L2 from the end of the step shaft to the end of the annular groove is: L1 < L2; the distance from the bottom of the annular groove to the end of the step shaft is smaller than the distance from the end of the step shaft to the end of the annular groove, thereby reducing the impact of the narrow gap here on the coolant flow field.

[0011] Furthermore, it also includes a sealing ring II, which is arranged between the water pump cover and the water pump base body. The water pump cover is fixedly installed on the outside of the water pump base body through the fastener I; through the cooperation of the sealing ring II and the fastener I, the sealed installation of the water pump is achieved.

[0012] Furthermore, the compression thickness of the crankcase cover gasket is L3, and the relationship between L3 and L1 is: L3<L1; the compression thickness of the crankcase cover gasket is less than the distance from the bottom of the annular groove to the end of the step shaft, so as to ensure the sealing effect.

[0013] Furthermore, the water pump also includes a water pump shaft installed in the water pump seat body and an impeller sleeved on the water pump shaft. The water pump cover is provided with a water inlet channel, the end of the water inlet channel is connected to the impeller, and the impeller is used to transport the coolant to the water chamber of the water pump.

[0014] Furthermore, it also includes a water seal dynamic ring, a water seal static ring part and an oil seal. The oil seal and the water seal static ring part are pressed onto the water pump seat body. The water pump shaft passes through the water seal static ring part and the oil seal. The water seal dynamic ring is pressed onto the impeller. The impeller is installed on the water pump shaft through threads.

[0015] Furthermore, the invention also includes an oil pump assembly disposed in the crankcase, including an oil pump driven wheel and a driven wheel fastening assembly for fixing the oil pump driven wheel to the oil pump shaft, wherein the driven wheel fastening assembly includes a flat washer I and a fastener II, wherein the flat washer I is disposed between the outer end surface of the driven wheel and the fastener II;

[0016] A connecting protrusion is formed on the fastener II, and a connecting recess that cooperates with the connecting protrusion is formed on the water pump shaft. The connecting protrusion and the connecting recess are engaged with each other, and a flat washer II is provided on the outer circumference of the connecting recess. By connecting the water pump shaft and the fastener II of the driven wheel, it is convenient to rotate the driven wheel of the oil pump, thereby driving the oil pump assembly and the water pump to rotate, thereby meeting the oil and water pumping needs of the engine.

[0017] The utility model provides a motorcycle, which comprises the water-cooled engine suitable for the motorcycle.

[0018] The beneficial effects of the utility model are as follows: the water-cooled engine of the utility model is suitable for motorcycles, and the water pump seat and the crankcase cover are integrated into one, and the water pump outlet is directly connected to the water inlet of the cylinder block, so that the cooling water path is located inside the engine, thereby optimizing the structural design of the cooling system, eliminating the need to set up external hoses or steel pipes, reducing the space occupied by the cooling system, making the overall structure compact, and after the coolant passes through the impeller, it quickly enters the cylinder block through the water pump outlet, the water channel length is short, the flow resistance of the coolant is small, the engine cooling effect is better, and it is conducive to the lightweight design of the engine, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure after removing the water pump cover;

[0022] Figure 3 It is a structural diagram of the water pump;

[0023] Figure 4 for Figure 2 The cross-sectional view along CC direction;

[0024] Figure 5Schematic diagram of the structure of the crankcase cover;

[0025] Figure 6 It is a structural diagram of the connection between the water inlet of the cylinder body and the water outlet of the water pump;

[0026] The above drawings include the following reference numerals:

[0027] 1. Water pump; 2. Crankcase; 3. Oil pump assembly; 4. Oil pump driven pulley; 5. Flat washer I; 6. Fastener II; 7. Flat washer II; 8. Oil seal; 9. Water seal static ring; 10. Water pump shaft; 11. Water seal dynamic ring; 12. Impeller; 13. Water pump cover; 13a. Water inlet channel; 14. Sealing ring II; 15. Crankcase cover; 15a. Outlet; 15b. Water pump outlet; 15c. Water pump seat; 15d. Water pump water chamber; 16. Sealing ring I; 17. Cylinder block; 17a. Cylinder block water inlet; 17b. Inlet; 18. Crankcase cover gasket. DETAILED DESCRIPTION

[0028] Figure 1 This is a schematic diagram of the structure of the utility model. Figure 2 for Figure 1 Schematic diagram of the structure after removing the water pump cover. Figure 3 The schematic diagram of the water pump is shown in Figure 2. Figure 4 for Figure 2 The CC-direction cross-sectional view, Figure 5 The schematic diagram of the crankcase cover is shown in Figure 2. Figure 6 It is a structural diagram of the connection between the cylinder water inlet and the water pump outlet, as shown in Figure 1-6As shown: the water-cooled engine suitable for motorcycles of this embodiment comprises a cylinder block 17, a crankcase cover 15 and a water pump 1, wherein the water pump 1 comprises a water pump seat body 15c integrated on the crankcase cover 15 and a water pump cover 13 mounted on the water pump seat body 15c and forming a water pump water cavity 15d with the water pump seat body 15c, wherein the water pump water cavity 15d extends toward the cylinder block water inlet 17a to form a water pump outlet 15b, and the water pump outlet 15b directly connects with the cylinder block water inlet 17a; the water pump seat body 15c of the water pump 1 is integrated on the crankcase cover 15, thereby saving the space occupied by the water pump compared with the water pump mounting structure of the prior art, thereby making the overall structure of the engine compact and water The pump cover 13 is installed at the opening of the water pump base body 15c and forms a cover for the water pump base body 15c and forms a water pump water chamber 15d with the water pump base body 15c, which can facilitate the assembly of the water pump cover 13 and make disassembly easier. The water pump water chamber 15d extends toward the direction of the cylinder body water inlet 17a to form a water pump water outlet 15b, so that the water pump water outlet 15b is directly connected to the cylinder body water inlet 17a, so that there is no need for an external hose or steel pipe structure, so that the coolant can flow through the water pump water chamber 15d, the water pump water outlet 15b and the cylinder body water inlet 17a in sequence through the action of the water pump 1 to cool the engine, which can reduce the flow resistance of the coolant during circulation and improve the cooling effect of the engine.

[0029] In the prior art, for compact twin-cylinder motorcycles, the engine installation space is relatively small. If method one is adopted, the space required for the whole vehicle to be installed is relatively large, which increases the width of the whole vehicle and affects the comfort of the whole vehicle. If method two is adopted, the water inlet of the cylinder body extends too long from the outer edge of the joint surface, and the gap between the extended section and the right cover is too small, making it difficult to disassemble and assemble the right cover. The water pump cover 13 and the cylinder body fastening bolts are too close to the frame, making it difficult to disassemble and assemble, and it is difficult to ensure the compression of the sealing ring, which poses a risk of water leakage. If method three is adopted, the water is transferred from the box body to the cylinder body cooling water channel, and water is inletted from a single place, the water channel is long, the water resistance is large, and the engine cooling effect is poor. The water-cooled engine of the motorcycle is realized by integrating the water pump seat 15c and the crankcase cover 15 into one body, and the water pump outlet 15b is directly connected to the cylinder block water inlet 17a, so that the cooling water path is located inside the engine, thereby optimizing the structural design of the cooling system. There is no need to set up external hoses or steel pipes, which reduces the space occupied by the cooling system and makes the overall structure compact. After the coolant passes through the impeller 12, it quickly enters the cylinder block through the water pump outlet 15b. The water path is short, the flow resistance of the coolant is small, the engine cooling effect is better, and it is conducive to the lightweight design of the engine, thereby reducing production costs.

[0030] In this embodiment, the water pump outlet 15b forms the outlet portion 15a, and the cylinder body water inlet 17a forms the inlet portion 17b, and the outlet portion 15a and the inlet portion 17b are interlocked with each other; the water pump outlet 15b forms the outlet portion 15a, and the cylinder body water inlet 17a forms the inlet portion 17b. Through the mutual interlocking of the outlet portion 15a and the inlet portion 17b, the positioning assembly and sealing functions can be achieved. The interlocking method can effectively seal and prevent coolant leakage. Of course, the outlet portion 15a and the inlet portion 17b can also be directly abutted. The preferred method is the mutual interlocking method, which is convenient for assembly and has a better sealing effect.

[0031] In this embodiment, the diameter of the inlet portion 17b is smaller than that of the outlet portion 15a. The outer circumference of the inlet portion 17b forms a stepped shaft, and the inner circumference of the outlet portion 15a forms an annular groove. The annular groove is provided with a step that cooperates with the stepped shaft.

[0032] A sealing ring I16 is provided on the outer circumference of the inlet portion 17b; the diameter of the inlet portion 17b is smaller than that of the outlet portion 15a, which is convenient for chimeric assembly. A stepped shaft is formed on the outer circumference of the inlet portion 17b, and an annular recessed groove matching the stepped shaft is formed on the inner circumference of the outlet portion 15a, and a multi-step structure is formed in the annular recessed groove. At the same time, a sealing ring I16 is provided on the outer circumference of the inlet portion 17b to form a radial seal, which, in combination with the chimeric structure, can facilitate assembly and positioning while achieving effective sealing.

[0033] In this embodiment, the relationship between the distance L1 from the bottom of the annular groove to the end of the stepped shaft and the distance L2 from the end of the stepped shaft to the end of the annular groove is: L1 < L2; the distance from the bottom of the annular groove to the end of the stepped shaft is smaller than the distance from the end of the stepped shaft (i.e., the end close to the cylinder block) to the end of the annular groove, thereby reducing the impact of the narrow gap here on the coolant flow and reducing the flow resistance.

[0034] In this embodiment, a sealing ring II14 is also included. The sealing ring II14 is arranged between the water pump cover 13 and the water pump base body 15c. The water pump cover 13 is fixedly installed on the outside of the water pump base body 15c by a fastener I; the fastener I is a bolt, and the water pump cover 13 is installed on the outside of the water pump base body 15c (that is, the open end face of the water pump base body 15c) by a bolt. At the same time, a sealing ring II14 is arranged between the water pump cover 13 and the water pump base body 15c, which can achieve sealing of the water pump 1 and prevent coolant leakage.

[0035] In this embodiment, the compressed thickness of the crankcase cover gasket 18 is L3, and the relationship between L3 and L1 is: L3<L1; the distance from the bottom of the annular groove to the end of the step shaft is greater than the compressed thickness of the crankcase cover gasket 18, thereby ensuring effective sealing of the entire structure.

[0036] In this embodiment, the water pump 1 also includes a water pump shaft 10 installed in the water pump seat body 15c and an impeller 12 sleeved on the water pump shaft 10. The water pump cover 13 is provided with a water inlet channel 13a, and the end of the water inlet channel 13a is connected to the impeller 12. The impeller 12 is used to transport the coolant to the water pump water chamber 15d; the water pump cover 13 is provided with a water inlet channel 13a, and the end of the water inlet channel 13a is connected to the impeller 12, so that the coolant enters from the inlet of the water inlet channel 13a, can flow to the impeller 12 and transport the coolant to the water pump water chamber 15d through the impeller 12, thereby cooling the engine.

[0037] In this embodiment, it also includes a water seal dynamic ring 11, a water seal static ring part 9 and an oil seal 8. The oil seal 8 and the water seal static ring part 9 are pressed onto the water pump seat body 15c, and the water pump shaft 10 is passed through the water seal static ring part 9 and the oil seal 8. The water seal dynamic ring 11 is pressed onto the impeller 12, and the impeller 12 is mounted on the water pump shaft 10 through threads; the provision of the water seal dynamic ring 11 and the water seal static ring part 9 can prevent the coolant from leaking to other positions of the structure when the water pump 1 is running, thereby affecting the operation of the equipment. The structure of the water seal dynamic ring 11, the water seal static ring part 9 and the oil seal 8 is an application of the existing technology and will not be repeated here.

[0038] This embodiment also includes an oil pump assembly 3 disposed in the crankcase 2, including an oil pump driven wheel 4 and a driven wheel fastening assembly for fixing the oil pump driven wheel 4 to the oil pump shaft, the driven wheel fastening assembly including a flat washer 15 and a fastener II 6, the flat washer 15 being disposed between the outer end surface of the oil pump driven wheel 4 and the fastener II 6; the fastener II 6 is a bolt, and the cross-section of the fastener II 6 is cross-shaped;

[0039] A connecting protrusion is formed on the fastener II6, and a connecting groove cooperating with the connecting protrusion is formed on the water pump shaft 10. The connecting protrusion and the connecting groove are interlocked with each other, and a flat washer II7 is provided on the outer circumference of the connecting groove; a connecting protrusion is provided on the end of the fastener II6 close to the water pump shaft 10, and a connecting groove cooperating with the connecting protrusion is provided on the water pump shaft 10, so that the oil pump driven wheel 4 can be rotated to drive the oil pump assembly 3 and the water pump to rotate, thereby realizing the oil and water pumping needs of the engine, without the need to set up a separate water pump driving mechanism, which can save internal space and the use of components.

[0040] The utility model provides a motorcycle, which comprises the water-cooled engine suitable for the motorcycle.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A water-cooled engine suitable for a motorcycle, characterized by: It includes a cylinder block, a crankcase cover and a water pump. The water pump includes a water pump base body integrated on the crankcase cover and a water pump cover installed on the water pump base body and forming a water pump water cavity with the water pump base body. The water pump water cavity extends toward the water inlet of the cylinder block to form a water pump outlet. The water pump outlet is directly connected to the water inlet of the cylinder block.

2. The water-cooled engine suitable for motorcycles according to claim 1, characterized in that: The water outlet of the water pump forms an outlet portion, and the water inlet of the cylinder body forms an inlet portion, and the outlet portion and the inlet portion are embedded with each other.

3. The water-cooled engine suitable for motorcycles according to claim 2, characterized in that: The diameter of the inlet portion is smaller than that of the outlet portion, the outer circumference of the inlet portion forms a stepped shaft, the inner circumference of the outlet portion forms an annular recessed groove, and the annular recessed groove is provided with a step that matches the stepped shaft; A sealing ring I is provided on the outer circumference of the inlet portion.

4. The water-cooled engine suitable for motorcycles according to claim 3, characterized in that: The relationship between the distance L1 from the bottom of the annular groove to the end of the step shaft and the distance L2 from the end of the step shaft to the end of the annular groove is: L1<L2.

5. The water-cooled engine suitable for motorcycles according to claim 3, characterized in that: It also includes a sealing ring II, which is arranged between the water pump cover and the water pump base body. The water pump cover is fixedly installed on the outer side of the water pump base body through a fastener I.

6. The water-cooled engine suitable for motorcycles according to claim 4, characterized in that: The compressed thickness of the crankcase cover gasket is L3, and the relationship between L3 and L1 is: L3<L1.

7. The water-cooled engine suitable for motorcycles according to claim 1, characterized in that: The water pump also includes a water pump shaft installed in the water pump seat body and an impeller sleeved on the water pump shaft. The water pump cover is provided with a water inlet channel, the end of the water inlet channel is connected to the impeller, and the impeller is used to transport coolant to the water chamber of the water pump.

8. The water-cooled engine suitable for motorcycles according to claim 7, characterized in that: It also includes a water seal dynamic ring, a water seal static ring part and an oil seal. The oil seal and the water seal static ring part are pressed onto the water pump seat body. The water pump shaft passes through the water seal static ring part and the oil seal. The water seal dynamic ring is pressed onto the impeller. The impeller is mounted on the water pump shaft through threads.

9. The water-cooled engine suitable for motorcycles according to claim 7, characterized in that: Also included is an oil pump assembly disposed in the crankcase, including an oil pump driven wheel and a driven wheel fastening assembly for fixing the oil pump driven wheel to the oil pump shaft, the driven wheel fastening assembly including a flat washer I and a fastener II, the flat washer I being disposed between the outer end surface of the driven wheel and the fastener II; A connecting protrusion is formed on the fastener II, and a connecting recess matched with the connecting protrusion is formed on the water pump shaft. The connecting protrusion and the connecting recess are embedded in each other, and a flat washer II is provided on the outer circumference of the connecting recess.

10. A motorcycle, characterized in that: The invention comprises a water-cooled engine suitable for a motorcycle as described in any one of claims 1 to 9.

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